When error Cannot lock down 82274202 byte memory area appears when using Jack, use the following command to enable real time processing.
~]# dpkg-reconfigure -p high jackd22
A pop-up box will appear. Select Yes to enable real time processing.
Add your user account to the audio group.
~]# adduser your_username audio
Restart the Jackd service.
~]# service jackd restart
Ensure the Jackd service is running.
~]# service jackd status